Abstract
SUMMARY: VOI imaging can provide higher image quality at a reduced dose for a subregion. In this study with a robot-driven C-arm FDCT system, the goals were proof of feasibility for inner ear imaging, higher flexibility during data acquisition, and easier processing during reconstruction. First a low-dose OV scan was acquired allowing an orientation and enabling the selection of the VOI. The C-arm was then moved by the robotic system without a need for patient movement and the VOI was scanned with adapted parameters. Uncompromised artifact-free image quality was achieved by the 2-scan approach and the dose was reduced by 80%–90% in comparison with conventional MSCT and FPCT scans.
Footnotes
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- DED
- detector entrance dose
- FPCT
- flat panel detector CT
- HD
- high-dose
- HU
- Hounsfield unit
- lp
- line pairs
- MSCT
- multisection CT
- OV
- overview
- SFOV
- scan field of view
- VOI
- volume of interest
- © 2012 American Society of Neuroradiology
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